Alternating-current rectifier



C. J. QUILL. ALIERNATING CURRENT RECTIFIER. APPLICATION FILED AUG-21, 1917. RENEWEDJKUQ. 18.1921.

INVENTOR. C.J. Quill.

Patented Nov. 1, 1921.

A TTORNE Y.

UNITED STATE PATENT OFFICE.

CHAIR/LES J. QUILL, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR 0F ONE-HALF TO WILLIAM M. .FILBEN, OF ST. PAUL, MINNESOTA.

ALTERNATING-CURRENT RECTIFIER.

Application filed August 21, 1917, Serial No. 187,479. Renewed August 18, 1921.

This invention relates to a mechanical alternating current rectifier of an extremely simple form which will be capable of supplying unidirectional current to any appliance requiring such current.

Another object of the invention is to provide an] alternating current rectifier which I give a very high efliciency in return will of unindirectional current as compared with current used, in addition to which the apparatus is so constructed that it cannot be short circuited or injured if the supply current is cut off, for it will be understood by those skilled in the art that some apparatus such as storage batteries give off a very destructive current when the supply stops and, unless special apparatus is installed to prevent it, destructive arcing will take place.

Another object of the invention is to pro-' duce an extremely simple and safe machine even though it only handles one half the sine wave of current.

The rectifier is operated by means of a synchronous motor capable of making 1800 R. P. M. where cycle alternating current is used.

Other objects of the invention pear as the description proceeds.

An embodiment of the invention is shown in the drawings in which the same reference numeral is applied to the same portion throughout, but I am aware that there may be modifications thereof.

Figure 1 is a diagrammatic view illuswill aptrating the arrangement of circuits and the rectifier,

Fig. 2 is a transverse sectional view of the rectifier, and

Fig. 3 is a section of the rectifier in a plane of its axis.

The rectifier shown and claimed herein is identical with one form of the rectifier shown specifically one half of in my patent application #145,789 on the same invention filed January 31st, 1917.

Specification of Letters Patent.

v bar 7 when the Patented Nov. 1, 1921.

Serial No. 493,461.

The numerals 1 and 2 indicate the two parts of a supply circuit extending from the generator G. to a transformer 3. Two wires 4 and 5 extend to a synchronous motor S. M., a wire 6 beingmconnected with 5 by the magnet 8 is energized. The wire 9 connecting with the wire 10 connected with the magnet 8 has a wire 6 and a wire 11.

The wire 11' connects the two magnets 12 and 13, the-former of which is provided with a permanent magnet 14 which maintains the points 15, 16 closed, when the polarity of the current in the wires 17, 18

is correct for the apparatus B to which the unidirectional current-is supplied.

- The rectifier 19 is mounted "on the shaft 20 of the synchronous motor.

The electromagnet has a connecting bar 21 and a dash pot 22 is provided which causes the bar 21 to be moved very slowly to the closed position for a purpose presently to be explained.

The rectifier proper consists of a pair of disks .23, 24:, made of a suitable insulating material, a hub 25 of the same material, two segments 26, 26, a collector ring 27 and two connections 28, 29. The ring 27 is mounted on a reduced portion of the hub and the segments 26, 26' are mounted on thel'arger 7 portion of the hub between the disks 23,24, and with their peripheries flush with the periphery of the larger portion of the hubs.

A brush 30 bears on the ring 27 while a brush 31 bears on the segments 26, 26 for the delivery of the unidirectional current produced to the apparatus for using it.

A wire 32 extends from the brush 30 to a movable switch bar which may be connected with any of the transformer taps 34.- to 39 inclusive. A wire 40 extends from the brush 31 to the contact 41 adjacent the connecting bar 21.

In operation, when current is supplied to the transformer 3 it also energizes the magnets 13 and 8, the latter closing at once, while the former closes very slowly to insure the proper current polarity before ourrent is sent to the battery B.

sent is of the wrong polarity,

point will be that of the coil, and if it is energized by a current of the proper polarity, the points 15, 16 will remain closed. If the motor is out of step, or it the current the points 15, 16 will be separated, since only when the current passes through the coil 12 to make its right hand end positive will the permanent magnet 1-1 allow it to stay down. \Yh'cn the circuit is broken at 15, 16, the entire system stops, but as soon as it is stopped. the contacts 15, 16 are again made, and the motor is again started. It necessary this action will occur several times until the current comes on in the magnet 12 of the proper polarity. \Vhen it does, the connecting bar 21 will have time to close and the load may be continued as long as desired.

The foregoing construction gives a rapidly pulsating unidirectional current, but since the pulsations are so rapid they do not affect the operation of the apparatus using said current.

Having thus described my invention what I claim as new and desire to secure by Letters Patent of the United States is as follows, express reservation being made of permissible 'rnodifications.

A current rectifier comprising an alternating current supply circuit, a synchronous motor operated thereby, an alternating current ring, a pair of quarter segments electrically connected with the ring, a brush bearing on the ring, another brush bearing on the segments, a load circuit for direct current, an extension therefrom to the alternating current supply, a polarity indicating circuit closer in the direct circuit. and means to drop the motor out if it is not in step to deliver current of the proper polarity.

In testimony whereof I have hereunto set my hand this 6 day of August A. D. 1917.

GHARLE so J. oo LL. 

